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Magnetorheological fluid

About: Magnetorheological fluid is a research topic. Over the lifetime, 8538 publications have been published within this topic receiving 131502 citations. The topic is also known as: MRF & MR fluid.


Papers
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Journal ArticleDOI
15 Apr 2017-Wear
TL;DR: In this article, a magnetorheological fluid based polishing process is developed for internal surface finishing of cylindrical workpiece, where the effect of induced magnetic field and magnetic normal force for different finishing cycles have been proposed.

52 citations

Journal ArticleDOI
TL;DR: In this article, a constitutive model for electrorheological and magneto-rheological fluids and devices is presented for the representation of the predator-prey regime.
Abstract: Phenomenological constitutive models for electrorheological and magneto-rheological fluids and devices in the literature have used various approaches for the representation of the preyield regime. ...

52 citations

Journal ArticleDOI
TL;DR: In this article, a 7.16 m long stay cable with a prototype-to-model scale factor of 8 was tested with a magnetorheological (MR) damper.
Abstract: As primary members of cable-stayed bridges, cables are susceptible to vibrations because of their low intrinsic damping. Mechanical dampers have been used to improve cable damping. Magnetorheological (MR) dampers have been proven efficient for seismic applications because of their large output damping forces, stable performance, low power requirement, and quick response from bot hl aboratory research and field practice. In this paper, experimental work was carried out to demonstrate that MR dampers are also suitable for cable vibration control. First, a MR damper was tested with various test parameters to obtain the performance curves of the MR damper under different loading conditions, including different electric currents, loading frequencies, loading wave types, and working temperatures. The MR damper was then installed on a cable to reduce the cable vibration. A 7.16 m long stay cable with a prototype-to-model scale factor of 8 was established for this study. The frequencies of the stay cable under different tension forces were measured and compared with those obtained through theoretical calculations. Then, a free vibration control test was carried out with the MR damper being installed at the 1/4 point of the cable. In the forced vibration test, a shaker was installed at 0.18 m from the lower end of the cable. The measured data show that the damper is efficient for cable vibration control within its working current range (zero to maximum) although there is a saturation effect. It was also observed that the damper could reduce cable vibration under a variety of excitation frequencies, especially for resonant vibrations.

52 citations

Journal ArticleDOI
TL;DR: In this article, a magnetorheological fluid (MRF) fan drive prototype for automotive truck application is designed and tested for both performance and durability, and a dual concentric gap with drum rotor design is chosen to meet the required torque capacity, packaging and mass constraints.
Abstract: A magnetorheological fluid (MRF) fan drive prototype for automotive truck application is designed and tested for both performance and durability. A dual concentric gap with drum rotor design is chosen to meet the required torque capacity, packaging, and mass constraints. Finite element magnetostatic modeling is performed to size the electromagnetic circuit and achieve the desired flux density levels in the MR fluid gaps. The clutch is filled with a custom-formulated MR fluid. Performance testing shows excellent speed control and response. The required 40 N-m torque capacity is achieved along with low drag speed, which is a key design characteristic of the fan drive. The clutch successfully passed several 500 h durability tests in a test cell environment. Performance testing indicates that the MRF clutch maintains its required torque capacity with very little increase in drag speed over the duration of the tests indicating no fluid thickening issues. The total dissipated energy in these tests is about 3.8GJ. The total specific dissipated energy for these tests is more than seven times higher than the 10 7 J/cm 3 upper limit previously suggested in the literature.

52 citations

Journal ArticleDOI
TL;DR: In this paper, the dynamic mechanical responses of magnetorheological elastomer composites to applied magnetic fields are investigated through dynamic mechanical analysis and it is found that a small amount of carbon nanotubes can effectively improve the mechanical performance of conventional MR elastomers.
Abstract: Magnetorheological (MR) elastomer composites with the addition of multi-walled carbon nanotubes are developed. The dynamic mechanical responses of the MR nanocomposites to applied magnetic fields are investigated through dynamic mechanical analysis. It is found that a small amount of carbon nanotubes can effectively improve the mechanical performance of conventional MR elastomers. The MR nanocomposites have shown not only large jumps in zero-field dynamic stiffness and damping, but also higher magnetic-field-induced improvement in these dynamic mechanical properties.

52 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20241
2023283
2022678
2021419
2020512
2019652